There was a sense of a Senate returning to form as Sen. Rand Paul, R-Ky., munched on a Kit Kat bar in the middle of his 13-hour filibuster - a break from his reading articles about military drones. This grandstanding didn't stop the confirmation of John Brennan as CIA director, unlike the silent holds that have blocked qualified candidates from filling the holes in our judiciary.

Now it is time to turn that rhetorical passion into legislative action. If Paul and his acolytes are serious about restraining executive authority, then they should set their targets on the Authorization for Use of Military Force Against Terrorists. Passed after the terrorist attacks on 9/11, the AUMF granted the president authority to use all necessary force against those who planned, authorized committed or aided in the 9/11 attacks or those who harbored them. Since then, it has been used to justify military force not just in Afghanistan, but Pakistan and Yemen. And against U.S. citizens. Without any explicit restrictions, folks outside the White House are left wondering whether Congress authorized the president to use military force anywhere that could possibly house al-Qaida sympathizers. Legislative history implies that Congress specifically did not include authority within our national borders, but we shouldn't have to guess at whether the president can kill citizens on domestic soil.

Texas Sen. Ted Cruz has joined Paul in introducing a bill to prohibit drone killings of citizens on U.S. soil if they don't represent an imminent threat. But why not look at the AUMF itself? When contemplating presidential authority, we hope that Democrats always imagine a President Dick Cheney. And for Republicans, well, President Barack Obama seems to foster enough healthy skepticism. But for too long both parties have cared more about partisan politics than the ramifications of unchecked presidential power. We hope Paul's filibuster will help bring an end to that era.